5
Last change
on this file since 9c3bae11 was
9c3bae11,
checked in by Sebastian Huber <sebastian.huber@…>, on 04/21/16 at 05:52:19
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rtems: Avoid Giant lock for dual ported memory
There is no need for an ISR lock since the Dual_ported_memory_Control is
immutable after initialization. ISR disable is enough for deletion
safety on uni-processor configurations.
Update #2555.
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-
Property mode set to
100644
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File size:
1.2 KB
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1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS Port External to Internal |
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5 | * @ingroup ClassicDPMEM |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2014. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/rtems/dpmemimpl.h> |
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22 | #include <rtems/score/address.h> |
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23 | |
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24 | rtems_status_code rtems_port_external_to_internal( |
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25 | rtems_id id, |
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26 | void *external, |
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27 | void **internal |
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28 | ) |
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29 | { |
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30 | Dual_ported_memory_Control *the_port; |
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31 | ISR_lock_Context lock_context; |
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32 | uint32_t ending; |
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33 | |
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34 | if ( internal == NULL ) { |
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35 | return RTEMS_INVALID_ADDRESS; |
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36 | } |
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37 | |
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38 | the_port = _Dual_ported_memory_Get( id, &lock_context ); |
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39 | |
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40 | if ( the_port == NULL ) { |
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41 | return RTEMS_INVALID_ID; |
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42 | } |
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43 | |
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44 | ending = _Addresses_Subtract( external, the_port->external_base ); |
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45 | |
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46 | if ( ending > the_port->length ) { |
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47 | *internal = external; |
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48 | } else { |
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49 | *internal = _Addresses_Add_offset( the_port->internal_base, ending ); |
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50 | } |
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51 | |
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52 | _ISR_lock_ISR_enable( &lock_context ); |
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53 | return RTEMS_SUCCESSFUL; |
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54 | } |
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